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Observe the picture of an activity given as Fig. 7.4 carried out with leaves of plants and polythene bag.

Now answer the following:

(a) Which process is demonstrated in the activity?

(b) When will this activity show better results – on a bright sunny day or a cloudy day?

(c) What will you observe in the polythene bag after a few hours of setting up the activity?

(d) Mention any one precaution you must take while performing this activity.

Answers (1)

(a) The process of transpiration is demonstrated in the given activity. The loss of water in the vapor-form from the exposed parts of leaves is called transpiration.
(b) This activity will show better results on a bright sunny day because the rate of transpiration increases in the presence of strong sunlight.
(c) After a few hours, a thin layer of water vapour will be seen inside the polythene cover.
(d) The set-up required to be airtight.
 

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Priyanka Kumari

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